我想，不管是做什么样的app。一般都会涉及到图片点击方法，和左右滑动的功能吧。今天我就把自己的实现拿来分享一下。图片的加载用到了picasso的图片加载工具。
第一步：注入依赖
compile 'com.squareup.picasso:picasso:2.5.2' compile 'com.github.chrisbanes:PhotoView:1.3.0'
第二步，我们就来实现这个功能。多张图片左右滑动，这需要用到ViewPager这个类。
且看布局：
<uk.co.senab.photoview.sample.HackyViewPager xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/iv_photo" android:layout_width="match_parent" android:layout_height="match_parent"/>
这里用到了自定义的ViewPager
public class HackyViewPager extends ViewPager {
public HackyViewPager(Context context) {
super(context);
}
public HackyViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
try {
return super.onInterceptTouchEvent(ev);
} catch (IllegalArgumentException e) {
e.printStackTrace();
return false;
}
}
}
这个是点击之后跳转到大图的Activity,来显示大图。最重要也是很简单的一步：
package uk.co.senab.photoview.sample;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import com.squareup.picasso.Callback;
import com.squareup.picasso.Picasso;
import uk.co.senab.photoview.PhotoView;
import uk.co.senab.photoview.PhotoViewAttacher;
public class PicassoSampleActivity extends AppCompatActivity {
ViewPager mViewPager;
//String position;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_simple);
mViewPager = (HackyViewPager) findViewById(R.id.iv_photo);
setContentView(mViewPager);
mViewPager.setAdapter(new SamplePagerAdapter());
//position=getIntent().getStringExtra("position");
//设置默认的坐标，实际情况不要写死，只需点击哪张图片的position，并传过来接受就可以了，就默认显示点击图片的大图。
//mViewPager.setCurrentItem(Integer.parseInt(position));
mViewPager.setCurrentItem(2);
}
static class SamplePagerAdapter extends PagerAdapter {
//这里暂时写死了，实际情况中要从服务端获取图片地址结合，传过来
private static final String[] url = {"/media/Bist9mvIYAAeAyQ.jpg", "/album/whcrop%3D657%2C370%3Bq%3D90/sign=2c994e578a82b9013df895711cfd9441/09fa513d269759eede0805bbb2fb43166d22df62.jpg",
"/d/file/2013-11-14/13631d143b7076dc3257b1e516a2a9a2.jpg", "/f5/63/d/7.jpg"};
@Override
public int getCount() {
return url.length;
}
@Override
public View instantiateItem(ViewGroup container, int position) {
PhotoView photoView = new PhotoView(container.getContext());
final PhotoViewAttacher attacher = new PhotoViewAttacher(photoView);
Picasso.with(container.getContext())
.load(url[position])
.into(photoView, new Callback() {
@Override
public void onSuccess() {
attacher.update();
}
@Override
public void onError() {
}
});
container.addView(photoView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
return photoView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
}
有了这个工具我们很轻松就实现了图片点击放大，左右活动，缩放等功能。
